[gentoo-soc] Rework porthole for portage API -- week 5

[Detlev Casanova]

Hello,
This last week wasn't a google summer of code week, it was a big exam week. I 
managed to do some work on the pkgcore backend but that was nothing exciting :
 * Check what functions could be implemented with pkgcore (pkgcore doesn't 
provide everything we need in porthole)
 * Have a first look of how actions (install, uninstall, update) will be 
implemented.

As those 5 first week have been a bit sparse GSoC wise, I'll try to do my best 
to catch up the timeline.

This week, I'll continue working on the pkgcore module :
 * Implement lib.py functions that can be implemented with pkgcore
 * implement actions (install, uninstall, update)

Next step will be to use and debug the portage's api action functions.

Detlev.